攀西某工矿区农田土壤重金属污染特征及环境现状

Characteristics and environmental status of heavy metal pollution in farmland soil of an industrial and mining area in Panxi

采集攀西某工矿区透底河旁农田土壤,分析重金属Cr,Ni,Cu,Zn,Cd和Pb含量,探讨重金属间关系,评价其环境质量现状。相关性分析表明,Cr与Ni相关性极为显著,判定系数为0.371﹤0.4,说明Cr的含量不仅受Ni的影响,还受其它金属影响;Pb与Ni、Cr及Cr与Zn、Cd相关性不显著,表现出一定异源性。单因子指数显示,仅Pb污染水平表现为清洁。根据6种重金属的单因子污染指数平均值大小,得出研究区土壤受重金属污染程度为:Ni﹥Cd﹥Cr﹥Zn﹥Cu﹥Pb。内梅罗污染综合指数最大值为5.87,最小值为1.01,平均值为3.03;在52个样本中59.61%的样本属于中度污染水平,30.77%的样本属于重度污染水平,9.62%的样本属于轻度污染水平,。整体上研究区土壤环境质量属于重度污染。

The contents of heavy metals Cr,Ni,Cu,Zn,Cd and Pb were analyzed in the farmland soil near a permeable river in a mining area of Panxi,and the relationship between heavy metals was discussed.The correlation analysis shows that the correlation between Cr and Ni is very significant,and the determination coefficient is 0.371<0.4,indicating that the content of Cr is not only affected by Ni,but also by other metals.Pb has no significant correlation with Ni,Cr and Cr with Zn and Cd,showing a certain heterogenicity.The single factor index shows that only Pb pollution level is clean.According to the average value of single factor pollution index of 6 kinds of heavy metals,the degree of heavy metal pollution of soil in the study area is Ni>Cd>Cr>Zn>Cu>Pb.The maximum value of Nemero pollution composite index was 5.87,the minimum value was 1.01,and the average value was 3.03.Among the 52 samples,59.61%belong to the moderate pollution level,30.77%belong to the severe pollution level,and 9.62%belong to the mild pollution level.On the whole,the soil environmental quality in the study area is seriously polluted.